Problem with animation using sk mobile mannequin

So I am using the sk mobile mannequin witn the sk mannequin animations. I migrated the animations from a third person template to a first person template. When I play the animation my character arm and hand appear in the wrong position… I would like to know how could I fix it without changing the skeleton?

Still an issue, 2019…

It is not a bug.

First you must check Show Retargeting Options in Skeleton Tree:

Next change to Skeleton every bone from spine_01

to thigh_twist_01_r